As a general rule, most portable players produced by Sony will not be able to play cassettes. This applies to current models and it is still possible to buy an out of production model which still has one.
Orange, portable cassette players are rare but they do have them. Try this site: http://www.videoavid.com/buy-electronics/p/Sony-WMFQ-1-O-Portable-Cassette.htm
Most cassette players nowadays supports playing dolby and records at the same time. This is one example -> O Coby O - Portable Am/Fm Cassette Player/Recorder or Sony Standard Portable Player/Cassette Recorder.
The best Sony CD players according to user reviews on the Sony website is: Xplod CD Radio Cassette Recorder. It cost $130, it has a great bass response, comes with a handle therefore portable, includes a remote.
No, Sony portable radio players don't have CD players built in them and cannot play CDs. Sony does make CD radio players, but they are not marketed as portable.
Manufacturers that still make cassette CD players are Sony, Emerson, Naxa Electronics, Supersonic, Teac and Jensen. You can also find products to convert from cassettes to digital formats.
There are several car cassette players that offers a headphone jack. Sony and panasonic are two cassette players that offers a headphone jack
They have very few cassette decks that they still produce.
Sony portable DVD players range in price from around $75 to $250 and up. The cost will depend on the features you want and where you purchase the DVD player.
Sony makes the best portable CD Players because of the G protection it comes with.
In my opinion the best Sony Boombox on the market today would be the Sony CFDG700CP CD boom box CD/cassette recorder and it can be found at http://www.amazon.com/Sony-CFD-S350-Cassette-Portable-Boombox/dp/B0007XHLXO for the low price of $99.95 used.
Sony still makes their classic Walkmans, as they have for the past couple decades.
Yes, there are still many companies that make portable CD players. Memorex, Sony, Coby, and GPX all make portable CD players that can be found at stores such as RadioShack, Walmart, or Target.